Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba3be9b77d96292…

MALICIOUS

PDF

97.7 KB Created: 2021-04-04 18:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de3d6f5b58df8a1c01dd5995f6d7f58e SHA-1: 9fd078928b0cfbd2a5b15b9fe6cd785f8d1e168d SHA-256: 6ba3be9b77d962923634b2342af5b1fbc6c9a6603eada40c8ebc663746c6229c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=kwikset+909+manual PDF link annotation
    • http://smirno.life/how_many_carbs_should_a_vegan_eat_to_lose_weightf24wp.pdfIn PDF document text
    • http://lnstagram-support.live/sasowizunimavekewemop5bcm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5fed0fd97687f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_603151648fe11.pdfIn PDF document text
    • http://amandeepsadyora.com/how_to_use_a_cricut_expression_machinexo1bc.pdfIn PDF document text
    • http://azorocheat1.xyz/385888532826gdj1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_6045025598c6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87771662-2a07-409d-b4d4-cce0e9b0dc45/why_did_george_have_to_kill_lennie.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_b6948d91dfd447cea788b1b876490ae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a2b293-101b-4523-a817-4049ab98dd09/48828426135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad40bebf-f597-4e7f-b308-51359531be7b/digupeterezosojovakazig.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/lidepenipinemenuf.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_f3d2f7bd4a2e411ea410c42a13743b08.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_86b45bef690d40459f741fc3acd33c39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d3ef08-9301-4778-b008-77e14d238f6f/11699331351.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/kedod.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/dragonscale_leatherworking_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/date_format_english_vs_french.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/gejizo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/riddles_for_adults_funny_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 5160 bytes
SHA-256: 5b57c54641f590b7cd222646babcb406cbe4a8e35130e468446fe4b3c9ef0398
font_01_sfnt_off00015061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 12396 bytes
SHA-256: 7ce1e0eec66222593562d3afc329ae1b1038d4a41aea4f830795f5bfd2038fb9